Soil available microelement contents are essential mineral nutrients for plant growth, and important parts of organic nutrient and soil fertility, they play important roles in growth and development of plants, community composition of the vegetation and structure and function of the ecosystem as well. The study on spatial variation characteristics of five soil available microelement including B, Fe, Cu, Zn and Mn as well as their influencing factors in the terrestrial ecosystem at a provincial scale is the fundamental basis of the study on regulate the circulation of trace elements, improve the yield and quality of plants, and formulate the formula card for accurate fertilization. Based on the data of the 16 582 soil samples collected in the topsoil layer (0~20 cm) of the farmlands during implementation of the project of soiltestbased formulated fertilization in Jiangxi Province in 2012, using pearson correlation analysis, spearman correlation analysis, partial correlation analysis, combined with oneway variance analysis and geostatistics, analysing the spatial variation characteristics of soil available microelement contents and their influencing factors. Results show as follows: ① Soil available B, Fe, Cu, Zn and Mn were reached the above moderate level, B showed strong variability, other soil available microelement showed moderate variability. ② In respect of the spatial structure, soil available B, Fe, Cu, Zn and Mn of the nuggest/still ratio were 15.68%, 87.63%, 12.09%, 25.27% and 77.98%, which show B and Cu have strong spatial correlation, Zn showed moderate spatial correlation and Fe and Mn indicated weak spatial correlation. In respect of the spatial distribution, soil available B content showed a spatial distribution tendency with lower in two sides and higher in middle, Cu, Zn and Mn displayed a similar distribution tendency seen smooth and there is no discernible distribution rule of Mn. ③ Pearson correlation analysis and partial correlation analysis showed that there is a definite coupling relationship between five soil available microelements but there is no direct contact. Spearman correlation analysis and oneway variance analysis results showed that topographic factors, soil chemical factors(including pH, organic matter and total nitrogen), soilforming factor and stochastic factors had significant impacts on the spatial variability of five soil available microelements(P<0.05). The results can provide a reliable reference for the formulation of soil testing formula fertilizer card, the utilization and management of cultivated land resources and the planting of good quality and high yield in Jiangxi Province.

Key words：Jiangxi Province; soil available microelement; spatial variability; correlation analysis; partial correlation analysis; influencing factors